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Investigators have determined that this morning's fire at Jim Clark marina was accidental – caused by an explosion when a fuel vapor in the bilge of a 36-foot wooden motor boat was ignited by a spark from the boat's electrical equipment.

The fire burned three boats and three house boats, causing $200,000 in damages, according to the Seattle Fire Department.

Randy Chase lives nearby and said he heard a "huge explosion" about 4 a.m. before 20-foot-high flames engulfed one of the boats.

Firefighters untied the boat to prevent the flames from spreading, and they doused the area with foam and water.

"They knocked it down quick. I was expecting to see more damage," Chase said.

Fire Department spokeswoman Helen Fitzpatrick says one boat sank, one burned to the water line and the third has damage to the exterior. One of the boat houses completely collapsed and the other two were damaged on the exterior.

Two teens were airlifted to Harborview Medical Center in Seattle after a single-car crash on Bucoda Highway (Highway 507) just south of Tenino Friday afternoon.

The Washington State Patrol reports that a 1986 Toyota Celica was travelling south on Bucoda Highway around 1:20 p.m. when it drifted across the northbound lanes. It then went off of the highway and crashed into a number of trees before coming to a stop.

The driver, a 19-year-old man from Tenino, and his passenger, a 19-year-old woman from Woodland, were both seriously injured in the crash. They were airlifted to Harborview for treatment.

Troopers are still investigating why the car crossed the highway and crashed.